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Wikipedia definition
1. Flying pigThe phrase "when pigs fly" is an adynaton—a figure of speech so hyperbolic that it describes an impossibility. The implication of such a phrase is that the circumstances in question (the adynaton, and the circumstances to which the adynaton are being applied) will never occur. Because of the historical importance of the pig industry to the city, prominent in the local iconography of Cincinnati are such events as the Big Pig Gig and the Flying Pig Marathon.
Read “Flying pig” on English Wikipedia
Read “空飛ぶ豚” on Japanese Wikipedia
Read “Flying pig” on DBpedia

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